IowaRV9Dreamer
Well Known Member
I am wondering if my fuel cap flanges are OK. These are brand new standard caps from my wing kit. The picture shows the cap in the flange, laying face down on the bench.
![](/community/proxy.php?image=http%3A%2F%2Fimg220.imageshack.us%2Fimg220%2F7510%2Fdcp3774qk4.jpg&hash=6e655464311e4ef55795978e96127e80)
What concerns me is that at least 50% of the brown O-ring is unsupported. You can tell by the (blurry) picture - see how much of the O-ring you can see sticking out above the flange. The O-ring is just barely catching the bottom edge of the flange (top edge in the picture because it is upside down).
The flange appears to me to be not long enough. If this was installed, it doesn't seem like it would make much of a seal. If the flange was longer, the O-ring would be more compressed and make a better seal, right? I could imagine with the right tolerance stackup and putting the cap in extra hard that the O-ring might slip off. Why didn't they make the flange an extra 1/8 inch deep?
It looks to me like a defect, but maybe I don't understand the caps or how they seal. It looks like turning the nut might help but these are pretty darn tight already.
Am I completely wrong about this? I'd love to hear from you experts out there.
Thanks!
![](/community/proxy.php?image=http%3A%2F%2Fimg220.imageshack.us%2Fimg220%2F7510%2Fdcp3774qk4.jpg&hash=6e655464311e4ef55795978e96127e80)
What concerns me is that at least 50% of the brown O-ring is unsupported. You can tell by the (blurry) picture - see how much of the O-ring you can see sticking out above the flange. The O-ring is just barely catching the bottom edge of the flange (top edge in the picture because it is upside down).
The flange appears to me to be not long enough. If this was installed, it doesn't seem like it would make much of a seal. If the flange was longer, the O-ring would be more compressed and make a better seal, right? I could imagine with the right tolerance stackup and putting the cap in extra hard that the O-ring might slip off. Why didn't they make the flange an extra 1/8 inch deep?
It looks to me like a defect, but maybe I don't understand the caps or how they seal. It looks like turning the nut might help but these are pretty darn tight already.
Am I completely wrong about this? I'd love to hear from you experts out there.
Thanks!